A-63054 February 2004
7-5
Bar code and patch
code reading and
OCR indexing with
i800 Series Scanners
For all i800 Series Scanners, bar code and patch code reading and OCR
indexing (when performed by Capture Software) is done using the bitonal front
or rear images.
When dual stream scanning (i.e., scanning color and bitonal simultaneously)
with an i820 Scanner or i840 Scanner, the bitonal images are used for bar
code and patch code reading and OCR indexing. When a bar code/patch
code/OCR text is detected, all four images (Color front; Color rear; Bitonal
front; Bitonal rear) of the page are either deleted or attached to the new/current
document or batch according to your Bar Code/Patch Code/OCR Setup.
When color only scanning with an i820 or i840 Scanner, Capture Software will
still scan the bitonal images “behind the scenes” using the grayed-out bitonal
Page and Image setup settings (e.g., Bitonal resolution, Contrast, Threshold).
While the “behind the scenes” bitonal images are never displayed or stored to
disk, they are used for bar code and patch code reading and OCR indexing.
Perform the following steps when setting up your color-only scanning
application:
1. Enable the bitonal cameras in Page Setup and adjust the Page and Image
bitonal settings as necessary to achieve the best bar code/patch code
read rate or OCR results.
2. Scan some sample pages in dual stream (color and bitonal
simultaneously) to make sure that bar code/patch code/OCR reading
works correctly.
3. Go back into Page Setup.
4. Disable the bitonal cameras for production color-only scanning.
NOTES: When scanning a sample image in Bar Code/OCR Setup for the
purposes of defining bar code/OCR zones, Capture Software will
always scan and display the front bitonal image.
When setting the bitonal resolution to a higher value (e.g., 300 dpi) for
the purpose of obtaining better read rates on difficult-to-read bar
codes or for OCR indexing, overall scanner throughput may be
affected. For example, if you scan at
100 dpi Color only
and the
bitonal resolution is set to 300 dpi, the i840 Scanner will scan at 106
pages per minute (letter landscape) instead of 160 pages per minute.
This is because “behind the scenes,” the scanner is still scanning at
300 dpi bitonal.
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